Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Mixed-Flow Pump Impeller-Diffuser Optimization Method by Using CFX and HEEDS

CFX 와 HEEDS 를 이용한 사류펌프 임펠러-디퓨저 최적화방법

  • Received : 2015.04.08
  • Accepted : 2015.08.02
  • Published : 2015.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

An optimization process was developed to improve mixed-flow pump performance. The optimization process was combined with CFX (a computational fluid dynamics (CFD) code) and HEEDS (an optimization code). CFX is a widely used CFD software for turbo machinery, whereas HEEDS, which uses the SHERPA algorithm, is a newly introduced optimization code. HEEDS can use a large number of optimization variables; thus, it is possible to effectively consider interaction effects. In this paper, an impeller model, which is already optimized with design of experiments (DOE), is used as the base model. The optimization process developed in this paper shows an improved design within an acceptable timeframe.

본 논문에서는 사류펌프의 성능을 향상시키는 최적화 방법을 개발하였다. 본 연구에서 개발한 최적화 방법은 유동해석코드인 CFX 와 최적화 소프트웨어인 HEEDS 를 연계하는 프로세스로 이루어진다. CFX 는 유체기계해석 분야에서는 잘 알려진 소프트웨어로 해석결과의 신뢰성은 이미 검증되었으나, 새롭게 소개되고 있는 HEEDS 는 주로 구조해석 분야에서 최적화를 수행한 사례가 보고되어 있다. 이에 본 논문을 통해 유체기계에 적용하여 최적화 결과를 검토하였다. HEEDS 에는 SHERPA 라는 최적화 기법이 탑재되어 있으며, 다수의 설계변수를 설정할 수 있어 변수간의 교호작용 등을 효율적으로 검토할 수 있다. 본 논문에서는 DOE 방법으로 최적화가 이루어진 사류펌프 임펠러에 대해 개발된 방법을 적용하여 최적화 결과의 타당성과 안정성을 검토하였으며, 같은 방법을 디퓨저에 적용하여 최적화 형상을 검토하였다. 본 논문에서 개발된 최적화 방법을 이용하여 사류펌프 최적화를 수행한 결과, DOE 방법을 이용한 설계보다 개선된 결과를 적절한 시간 내에 얻을 수 있음을 확인하였다.

Keywords

References

  1. Lee, J. C., 2011, "Research trends in Pumps and Hydraulic Turbine," Journal of Fluid Machinery, Vol. 14, No. 2, pp. 65-67.
  2. Choi, Y. S., Lee, K. Y., Kim, S. and Kim, J. H., 2010, "Design Optimization of Mixed-flow Pump Impellers and Diffusers," Proceedings of the KFMA Annual Meeting, pp. 168-169.
  3. Kim, J. H., Jin, C. H. and Kim, K, Y., 2010, "High Efficiency Design of a Mixed-Flow Pump through Optimization Techniques," Proceedings of the KFMA Annual Meeting, pp. 31-32.
  4. Ferziger, J. H. and Peric, M., 1997, "Computational Methods for Fluid Dynamics," Springer.
  5. Raithby G.D. and Schneider, G.E., 1979, "Numerical Solution of Problems in Incompressible Fluid Flow," Treatment of the Velocity-Pressure Coupling. Numer. Heat Transfer, 2.
  6. Raw, M., 1996, "Robustness of Coupled Algebraic Multigrid for the Navier-Stokes Equations," AIAA Paper 96-0297, AIAA 34th Aerospace Sciences Meeting and Exhibit. Reno, NV.
  7. Raw, M., 1985, "A New Control-Volume Based Finite Element Procedure for the Numerical Solution of the Fluid Flow and Scalar Transport Equations," Ph.D.Thesis, University of Waterloo, Canada
  8. Coles, D.E. and Hirst, E.A., editors, 1969, "Computation of Turbulent Boundary Layers - 1968 AFOSR-IFP-Stanford Conference," Vol. 2, Stanford University, CA.
  9. Menter, F.R. and Grotjans, H., "Application of Advanced Turbulence Models to Complex Industrial Flows," AEA Technology GmbH, Staudenfeldweg 12 D-83624 Otterfing, Germany
  10. Esch, T., Menter, F.R. and Vieser, W., 2003, "Heat Transfer Predictions Based on Two-Equation Turbulence Models," 6th ASME-JSME Thermal Engineering Joint Conference, Hawaii.
  11. Menter, F.R., 1994, "Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications," AIAA-Journal 32(8), pp. 269-289.
  12. Schittkowski, K., 1985, "NLPQL: A Fortran Subroutine for Solving Constrained Nonlinear Programming Problems," Annals of Operations Research, Vol. 5, pp. 485-500.
  13. Goldberg, D.E., 1989, "Genetic Algorithms in Search, Optimization & Machine Learning," Addison Wesley Longman, Inc.
  14. "SHERPA - An Efficient and Robust Optimization/ Search Algorithm," Red Cedar Technology
  15. "A Benchmark Study of Optimization Search Algorithms," Red Cedar Technology
  16. Ingber, L., 1996, "Adaptive Simulated Annealing (ASA): Lessons learned," Control and Cybernetics, Vol. 25 No. 1,pp. 33-54.
  17. iSIGHT‐FD Version 2.5 User's Manual, 2007.
  18. 2014, ANSYS CFX Version 14 User's Manual.
  19. Kim, S., Choi, Y. S., Lee, K. Y. and Yoon, J. Y., 2007, "Effect of Blade Angle Distribution on the Performance of a Centrifugal Pump in a Fixed Meridional Shape," Proceedings of the SAREK Annual Meeting, pp. 21-26.